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Given f(x)=2x^2+ax+bf and knowing it has a local minimum at (2,-5); find the value of a and b

 Jul 6, 2020
 #1
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-b /2a  = 2         where b = 'a'    and   a = 2

 

- a /4 = 2

a = -8

 

2x^2 -8x+b    = -5   when x = 2

8 - 16 + b = -5

b = 3

 Jul 6, 2020

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